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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * The Internet Protocol (IP) module. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Donald Becker, <becker@super.org> | |
113aa838 | 11 | * Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
12 | * Richard Underwood |
13 | * Stefan Becker, <stefanb@yello.ping.de> | |
14 | * Jorge Cwik, <jorge@laser.satlink.net> | |
15 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> | |
e905a9ed | 16 | * |
1da177e4 LT |
17 | * |
18 | * Fixes: | |
19 | * Alan Cox : Commented a couple of minor bits of surplus code | |
20 | * Alan Cox : Undefining IP_FORWARD doesn't include the code | |
21 | * (just stops a compiler warning). | |
22 | * Alan Cox : Frames with >=MAX_ROUTE record routes, strict routes or loose routes | |
23 | * are junked rather than corrupting things. | |
24 | * Alan Cox : Frames to bad broadcast subnets are dumped | |
25 | * We used to process them non broadcast and | |
26 | * boy could that cause havoc. | |
27 | * Alan Cox : ip_forward sets the free flag on the | |
28 | * new frame it queues. Still crap because | |
29 | * it copies the frame but at least it | |
30 | * doesn't eat memory too. | |
31 | * Alan Cox : Generic queue code and memory fixes. | |
32 | * Fred Van Kempen : IP fragment support (borrowed from NET2E) | |
33 | * Gerhard Koerting: Forward fragmented frames correctly. | |
34 | * Gerhard Koerting: Fixes to my fix of the above 8-). | |
35 | * Gerhard Koerting: IP interface addressing fix. | |
36 | * Linus Torvalds : More robustness checks | |
37 | * Alan Cox : Even more checks: Still not as robust as it ought to be | |
38 | * Alan Cox : Save IP header pointer for later | |
39 | * Alan Cox : ip option setting | |
40 | * Alan Cox : Use ip_tos/ip_ttl settings | |
41 | * Alan Cox : Fragmentation bogosity removed | |
42 | * (Thanks to Mark.Bush@prg.ox.ac.uk) | |
43 | * Dmitry Gorodchanin : Send of a raw packet crash fix. | |
44 | * Alan Cox : Silly ip bug when an overlength | |
45 | * fragment turns up. Now frees the | |
46 | * queue. | |
47 | * Linus Torvalds/ : Memory leakage on fragmentation | |
48 | * Alan Cox : handling. | |
49 | * Gerhard Koerting: Forwarding uses IP priority hints | |
50 | * Teemu Rantanen : Fragment problems. | |
51 | * Alan Cox : General cleanup, comments and reformat | |
52 | * Alan Cox : SNMP statistics | |
53 | * Alan Cox : BSD address rule semantics. Also see | |
54 | * UDP as there is a nasty checksum issue | |
55 | * if you do things the wrong way. | |
56 | * Alan Cox : Always defrag, moved IP_FORWARD to the config.in file | |
57 | * Alan Cox : IP options adjust sk->priority. | |
58 | * Pedro Roque : Fix mtu/length error in ip_forward. | |
59 | * Alan Cox : Avoid ip_chk_addr when possible. | |
60 | * Richard Underwood : IP multicasting. | |
61 | * Alan Cox : Cleaned up multicast handlers. | |
62 | * Alan Cox : RAW sockets demultiplex in the BSD style. | |
63 | * Gunther Mayer : Fix the SNMP reporting typo | |
64 | * Alan Cox : Always in group 224.0.0.1 | |
65 | * Pauline Middelink : Fast ip_checksum update when forwarding | |
66 | * Masquerading support. | |
67 | * Alan Cox : Multicast loopback error for 224.0.0.1 | |
68 | * Alan Cox : IP_MULTICAST_LOOP option. | |
69 | * Alan Cox : Use notifiers. | |
70 | * Bjorn Ekwall : Removed ip_csum (from slhc.c too) | |
71 | * Bjorn Ekwall : Moved ip_fast_csum to ip.h (inline!) | |
72 | * Stefan Becker : Send out ICMP HOST REDIRECT | |
73 | * Arnt Gulbrandsen : ip_build_xmit | |
74 | * Alan Cox : Per socket routing cache | |
75 | * Alan Cox : Fixed routing cache, added header cache. | |
76 | * Alan Cox : Loopback didn't work right in original ip_build_xmit - fixed it. | |
77 | * Alan Cox : Only send ICMP_REDIRECT if src/dest are the same net. | |
78 | * Alan Cox : Incoming IP option handling. | |
79 | * Alan Cox : Set saddr on raw output frames as per BSD. | |
80 | * Alan Cox : Stopped broadcast source route explosions. | |
81 | * Alan Cox : Can disable source routing | |
82 | * Takeshi Sone : Masquerading didn't work. | |
83 | * Dave Bonn,Alan Cox : Faster IP forwarding whenever possible. | |
84 | * Alan Cox : Memory leaks, tramples, misc debugging. | |
85 | * Alan Cox : Fixed multicast (by popular demand 8)) | |
86 | * Alan Cox : Fixed forwarding (by even more popular demand 8)) | |
87 | * Alan Cox : Fixed SNMP statistics [I think] | |
88 | * Gerhard Koerting : IP fragmentation forwarding fix | |
89 | * Alan Cox : Device lock against page fault. | |
90 | * Alan Cox : IP_HDRINCL facility. | |
91 | * Werner Almesberger : Zero fragment bug | |
92 | * Alan Cox : RAW IP frame length bug | |
93 | * Alan Cox : Outgoing firewall on build_xmit | |
94 | * A.N.Kuznetsov : IP_OPTIONS support throughout the kernel | |
95 | * Alan Cox : Multicast routing hooks | |
96 | * Jos Vos : Do accounting *before* call_in_firewall | |
97 | * Willy Konynenberg : Transparent proxying support | |
98 | * | |
e905a9ed | 99 | * |
1da177e4 LT |
100 | * |
101 | * To Fix: | |
102 | * IP fragmentation wants rewriting cleanly. The RFC815 algorithm is much more efficient | |
103 | * and could be made very efficient with the addition of some virtual memory hacks to permit | |
104 | * the allocation of a buffer that can then be 'grown' by twiddling page tables. | |
e905a9ed | 105 | * Output fragmentation wants updating along with the buffer management to use a single |
1da177e4 LT |
106 | * interleaved copy algorithm so that fragmenting has a one copy overhead. Actual packet |
107 | * output should probably do its own fragmentation at the UDP/RAW layer. TCP shouldn't cause | |
108 | * fragmentation anyway. | |
109 | * | |
110 | * This program is free software; you can redistribute it and/or | |
111 | * modify it under the terms of the GNU General Public License | |
112 | * as published by the Free Software Foundation; either version | |
113 | * 2 of the License, or (at your option) any later version. | |
114 | */ | |
115 | ||
afd46503 JP |
116 | #define pr_fmt(fmt) "IPv4: " fmt |
117 | ||
1da177e4 LT |
118 | #include <linux/module.h> |
119 | #include <linux/types.h> | |
120 | #include <linux/kernel.h> | |
121 | #include <linux/string.h> | |
122 | #include <linux/errno.h> | |
5a0e3ad6 | 123 | #include <linux/slab.h> |
1da177e4 LT |
124 | |
125 | #include <linux/net.h> | |
126 | #include <linux/socket.h> | |
127 | #include <linux/sockios.h> | |
128 | #include <linux/in.h> | |
129 | #include <linux/inet.h> | |
14c85021 | 130 | #include <linux/inetdevice.h> |
1da177e4 LT |
131 | #include <linux/netdevice.h> |
132 | #include <linux/etherdevice.h> | |
133 | ||
134 | #include <net/snmp.h> | |
135 | #include <net/ip.h> | |
136 | #include <net/protocol.h> | |
137 | #include <net/route.h> | |
138 | #include <linux/skbuff.h> | |
139 | #include <net/sock.h> | |
140 | #include <net/arp.h> | |
141 | #include <net/icmp.h> | |
142 | #include <net/raw.h> | |
143 | #include <net/checksum.h> | |
144 | #include <linux/netfilter_ipv4.h> | |
145 | #include <net/xfrm.h> | |
146 | #include <linux/mroute.h> | |
147 | #include <linux/netlink.h> | |
148 | ||
1da177e4 | 149 | /* |
66018506 | 150 | * Process Router Attention IP option (RFC 2113) |
e905a9ed | 151 | */ |
ba57b4db | 152 | bool ip_call_ra_chain(struct sk_buff *skb) |
1da177e4 LT |
153 | { |
154 | struct ip_ra_chain *ra; | |
eddc9ec5 | 155 | u8 protocol = ip_hdr(skb)->protocol; |
1da177e4 | 156 | struct sock *last = NULL; |
cb84663e | 157 | struct net_device *dev = skb->dev; |
1da177e4 | 158 | |
66018506 | 159 | for (ra = rcu_dereference(ip_ra_chain); ra; ra = rcu_dereference(ra->next)) { |
1da177e4 LT |
160 | struct sock *sk = ra->sk; |
161 | ||
162 | /* If socket is bound to an interface, only report | |
163 | * the packet if it came from that interface. | |
164 | */ | |
c720c7e8 | 165 | if (sk && inet_sk(sk)->inet_num == protocol && |
1da177e4 | 166 | (!sk->sk_bound_dev_if || |
cb84663e | 167 | sk->sk_bound_dev_if == dev->ifindex) && |
09ad9bc7 | 168 | net_eq(sock_net(sk), dev_net(dev))) { |
56f8a75c | 169 | if (ip_is_fragment(ip_hdr(skb))) { |
66018506 | 170 | if (ip_defrag(skb, IP_DEFRAG_CALL_RA_CHAIN)) |
ba57b4db | 171 | return true; |
1da177e4 LT |
172 | } |
173 | if (last) { | |
174 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
175 | if (skb2) | |
176 | raw_rcv(last, skb2); | |
177 | } | |
178 | last = sk; | |
179 | } | |
180 | } | |
181 | ||
182 | if (last) { | |
183 | raw_rcv(last, skb); | |
ba57b4db | 184 | return true; |
1da177e4 | 185 | } |
ba57b4db | 186 | return false; |
1da177e4 LT |
187 | } |
188 | ||
861d0486 | 189 | static int ip_local_deliver_finish(struct sk_buff *skb) |
1da177e4 | 190 | { |
c346dca1 | 191 | struct net *net = dev_net(skb->dev); |
f145049a | 192 | |
c9bdd4b5 | 193 | __skb_pull(skb, ip_hdrlen(skb)); |
1da177e4 | 194 | |
e905a9ed | 195 | /* Point into the IP datagram, just past the header. */ |
badff6d0 | 196 | skb_reset_transport_header(skb); |
1da177e4 LT |
197 | |
198 | rcu_read_lock(); | |
199 | { | |
eddc9ec5 | 200 | int protocol = ip_hdr(skb)->protocol; |
32613090 | 201 | const struct net_protocol *ipprot; |
f9242b6b | 202 | int raw; |
1da177e4 LT |
203 | |
204 | resubmit: | |
7bc54c90 | 205 | raw = raw_local_deliver(skb, protocol); |
1da177e4 | 206 | |
f9242b6b | 207 | ipprot = rcu_dereference(inet_protos[protocol]); |
9c0188ac | 208 | if (ipprot != NULL) { |
1da177e4 LT |
209 | int ret; |
210 | ||
9c0188ac | 211 | if (!net_eq(net, &init_net) && !ipprot->netns_ok) { |
e87cc472 JP |
212 | net_info_ratelimited("%s: proto %d isn't netns-ready\n", |
213 | __func__, protocol); | |
9c0188ac AD |
214 | kfree_skb(skb); |
215 | goto out; | |
216 | } | |
217 | ||
b59c2701 PM |
218 | if (!ipprot->no_policy) { |
219 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
220 | kfree_skb(skb); | |
221 | goto out; | |
222 | } | |
223 | nf_reset(skb); | |
1da177e4 LT |
224 | } |
225 | ret = ipprot->handler(skb); | |
226 | if (ret < 0) { | |
227 | protocol = -ret; | |
228 | goto resubmit; | |
229 | } | |
7c73a6fa | 230 | IP_INC_STATS_BH(net, IPSTATS_MIB_INDELIVERS); |
1da177e4 | 231 | } else { |
7bc54c90 | 232 | if (!raw) { |
1da177e4 | 233 | if (xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
7c73a6fa | 234 | IP_INC_STATS_BH(net, IPSTATS_MIB_INUNKNOWNPROTOS); |
1da177e4 LT |
235 | icmp_send(skb, ICMP_DEST_UNREACH, |
236 | ICMP_PROT_UNREACH, 0); | |
237 | } | |
238 | } else | |
7c73a6fa | 239 | IP_INC_STATS_BH(net, IPSTATS_MIB_INDELIVERS); |
1da177e4 LT |
240 | kfree_skb(skb); |
241 | } | |
242 | } | |
243 | out: | |
244 | rcu_read_unlock(); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | /* | |
250 | * Deliver IP Packets to the higher protocol layers. | |
e905a9ed | 251 | */ |
1da177e4 LT |
252 | int ip_local_deliver(struct sk_buff *skb) |
253 | { | |
254 | /* | |
255 | * Reassemble IP fragments. | |
256 | */ | |
257 | ||
56f8a75c | 258 | if (ip_is_fragment(ip_hdr(skb))) { |
776c729e | 259 | if (ip_defrag(skb, IP_DEFRAG_LOCAL_DELIVER)) |
1da177e4 LT |
260 | return 0; |
261 | } | |
262 | ||
9bbc768a | 263 | return NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_IN, skb, skb->dev, NULL, |
1da177e4 LT |
264 | ip_local_deliver_finish); |
265 | } | |
266 | ||
6a91395f | 267 | static inline bool ip_rcv_options(struct sk_buff *skb) |
d245407e TG |
268 | { |
269 | struct ip_options *opt; | |
b71d1d42 | 270 | const struct iphdr *iph; |
d245407e TG |
271 | struct net_device *dev = skb->dev; |
272 | ||
273 | /* It looks as overkill, because not all | |
274 | IP options require packet mangling. | |
275 | But it is the easiest for now, especially taking | |
276 | into account that combination of IP options | |
277 | and running sniffer is extremely rare condition. | |
278 | --ANK (980813) | |
279 | */ | |
280 | if (skb_cow(skb, skb_headroom(skb))) { | |
7c73a6fa | 281 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); |
d245407e TG |
282 | goto drop; |
283 | } | |
284 | ||
eddc9ec5 | 285 | iph = ip_hdr(skb); |
22aba383 DL |
286 | opt = &(IPCB(skb)->opt); |
287 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
d245407e | 288 | |
c346dca1 | 289 | if (ip_options_compile(dev_net(dev), opt, skb)) { |
7c73a6fa | 290 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); |
d245407e TG |
291 | goto drop; |
292 | } | |
293 | ||
d245407e | 294 | if (unlikely(opt->srr)) { |
6e8b11b4 ED |
295 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
296 | ||
d245407e TG |
297 | if (in_dev) { |
298 | if (!IN_DEV_SOURCE_ROUTE(in_dev)) { | |
e87cc472 JP |
299 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
300 | net_info_ratelimited("source route option %pI4 -> %pI4\n", | |
301 | &iph->saddr, | |
302 | &iph->daddr); | |
d245407e TG |
303 | goto drop; |
304 | } | |
d245407e TG |
305 | } |
306 | ||
307 | if (ip_options_rcv_srr(skb)) | |
308 | goto drop; | |
309 | } | |
310 | ||
6a91395f | 311 | return false; |
d245407e | 312 | drop: |
6a91395f | 313 | return true; |
d245407e TG |
314 | } |
315 | ||
6648bd7e | 316 | int sysctl_ip_early_demux __read_mostly = 1; |
c7109986 | 317 | EXPORT_SYMBOL(sysctl_ip_early_demux); |
6648bd7e | 318 | |
861d0486 | 319 | static int ip_rcv_finish(struct sk_buff *skb) |
1da177e4 | 320 | { |
eddc9ec5 | 321 | const struct iphdr *iph = ip_hdr(skb); |
5506b54b | 322 | struct rtable *rt; |
1da177e4 | 323 | |
160eb5a6 DM |
324 | if (sysctl_ip_early_demux && !skb_dst(skb)) { |
325 | const struct net_protocol *ipprot; | |
326 | int protocol = iph->protocol; | |
327 | ||
160eb5a6 | 328 | ipprot = rcu_dereference(inet_protos[protocol]); |
9cb429d6 | 329 | if (ipprot && ipprot->early_demux) { |
160eb5a6 | 330 | ipprot->early_demux(skb); |
9cb429d6 ED |
331 | /* must reload iph, skb->head might have changed */ |
332 | iph = ip_hdr(skb); | |
333 | } | |
160eb5a6 DM |
334 | } |
335 | ||
1da177e4 LT |
336 | /* |
337 | * Initialise the virtual path cache for the packet. It describes | |
338 | * how the packet travels inside Linux networking. | |
e905a9ed | 339 | */ |
160eb5a6 | 340 | if (!skb_dst(skb)) { |
c6cffba4 DM |
341 | int err = ip_route_input_noref(skb, iph->daddr, iph->saddr, |
342 | iph->tos, skb->dev); | |
160eb5a6 DM |
343 | if (unlikely(err)) { |
344 | if (err == -EXDEV) | |
345 | NET_INC_STATS_BH(dev_net(skb->dev), | |
346 | LINUX_MIB_IPRPFILTER); | |
347 | goto drop; | |
2c2910a4 | 348 | } |
1da177e4 LT |
349 | } |
350 | ||
c7066f70 | 351 | #ifdef CONFIG_IP_ROUTE_CLASSID |
adf30907 | 352 | if (unlikely(skb_dst(skb)->tclassid)) { |
7a9b2d59 | 353 | struct ip_rt_acct *st = this_cpu_ptr(ip_rt_acct); |
adf30907 | 354 | u32 idx = skb_dst(skb)->tclassid; |
1da177e4 | 355 | st[idx&0xFF].o_packets++; |
fd3f8c4c | 356 | st[idx&0xFF].o_bytes += skb->len; |
1da177e4 | 357 | st[(idx>>16)&0xFF].i_packets++; |
fd3f8c4c | 358 | st[(idx>>16)&0xFF].i_bytes += skb->len; |
1da177e4 LT |
359 | } |
360 | #endif | |
361 | ||
d245407e TG |
362 | if (iph->ihl > 5 && ip_rcv_options(skb)) |
363 | goto drop; | |
1da177e4 | 364 | |
511c3f92 | 365 | rt = skb_rtable(skb); |
edf391ff | 366 | if (rt->rt_type == RTN_MULTICAST) { |
d8d1f30b | 367 | IP_UPD_PO_STATS_BH(dev_net(rt->dst.dev), IPSTATS_MIB_INMCAST, |
edf391ff NH |
368 | skb->len); |
369 | } else if (rt->rt_type == RTN_BROADCAST) | |
d8d1f30b | 370 | IP_UPD_PO_STATS_BH(dev_net(rt->dst.dev), IPSTATS_MIB_INBCAST, |
edf391ff | 371 | skb->len); |
5506b54b | 372 | |
1da177e4 LT |
373 | return dst_input(skb); |
374 | ||
1da177e4 | 375 | drop: |
e905a9ed YH |
376 | kfree_skb(skb); |
377 | return NET_RX_DROP; | |
1da177e4 LT |
378 | } |
379 | ||
380 | /* | |
381 | * Main IP Receive routine. | |
e905a9ed | 382 | */ |
f2ccd8fa | 383 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 | 384 | { |
b71d1d42 | 385 | const struct iphdr *iph; |
58615242 | 386 | u32 len; |
1da177e4 LT |
387 | |
388 | /* When the interface is in promisc. mode, drop all the crap | |
389 | * that it receives, do not try to analyse it. | |
390 | */ | |
391 | if (skb->pkt_type == PACKET_OTHERHOST) | |
392 | goto drop; | |
393 | ||
edf391ff NH |
394 | |
395 | IP_UPD_PO_STATS_BH(dev_net(dev), IPSTATS_MIB_IN, skb->len); | |
1da177e4 LT |
396 | |
397 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { | |
7c73a6fa | 398 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
399 | goto out; |
400 | } | |
401 | ||
402 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
403 | goto inhdr_error; | |
404 | ||
eddc9ec5 | 405 | iph = ip_hdr(skb); |
1da177e4 LT |
406 | |
407 | /* | |
c67fa027 | 408 | * RFC1122: 3.2.1.2 MUST silently discard any IP frame that fails the checksum. |
1da177e4 LT |
409 | * |
410 | * Is the datagram acceptable? | |
411 | * | |
412 | * 1. Length at least the size of an ip header | |
413 | * 2. Version of 4 | |
414 | * 3. Checksums correctly. [Speed optimisation for later, skip loopback checksums] | |
415 | * 4. Doesn't have a bogus length | |
416 | */ | |
417 | ||
418 | if (iph->ihl < 5 || iph->version != 4) | |
58615242 | 419 | goto inhdr_error; |
1da177e4 LT |
420 | |
421 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
422 | goto inhdr_error; | |
423 | ||
eddc9ec5 | 424 | iph = ip_hdr(skb); |
1da177e4 | 425 | |
e9c60422 | 426 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) |
58615242 | 427 | goto inhdr_error; |
1da177e4 | 428 | |
58615242 | 429 | len = ntohs(iph->tot_len); |
704aed53 | 430 | if (skb->len < len) { |
7c73a6fa | 431 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); |
704aed53 MC |
432 | goto drop; |
433 | } else if (len < (iph->ihl*4)) | |
58615242 | 434 | goto inhdr_error; |
1da177e4 | 435 | |
58615242 TG |
436 | /* Our transport medium may have padded the buffer out. Now we know it |
437 | * is IP we can trim to the true length of the frame. | |
438 | * Note this now means skb->len holds ntohs(iph->tot_len). | |
439 | */ | |
440 | if (pskb_trim_rcsum(skb, len)) { | |
7c73a6fa | 441 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); |
58615242 | 442 | goto drop; |
1da177e4 LT |
443 | } |
444 | ||
53602f92 | 445 | /* Remove any debris in the socket control block */ |
d569f1d7 | 446 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
53602f92 | 447 | |
71f9dacd HX |
448 | /* Must drop socket now because of tproxy. */ |
449 | skb_orphan(skb); | |
450 | ||
9bbc768a | 451 | return NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, dev, NULL, |
1da177e4 LT |
452 | ip_rcv_finish); |
453 | ||
454 | inhdr_error: | |
7c73a6fa | 455 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 456 | drop: |
e905a9ed | 457 | kfree_skb(skb); |
1da177e4 | 458 | out: |
e905a9ed | 459 | return NET_RX_DROP; |
1da177e4 | 460 | } |